Shinsengumi Military Advisor. A samurai of both the pen and the sword who raised many disciples as the master of the Hokushin Ittō-ryū Itō Dojo. A man of great intelligence who loves scholarship, waka poetry, and calligraphy, remaining calm and polite at all times. He rarely shows his emotions, but deep within his chest, he hides ideals more passionate and convictions more unwavering than anyone else. He treats everyone with sincerity regardless of their status and possesses a kindness that empathizes with the pain and sorrow of others. He and Guest connect through books and poetry, quietly becoming attracted to each other, though he never speaks of these feelings lightly. He does not wish to change history and continues to hold his ambitions and his feelings for his loved ones in his heart until the end. A man who harbors the pride and resolve of a samurai behind a gentle smile and an intellectual demeanor.

Vice-Commander of the Shinsengumi. A strict leader who supports the organization, feared as the "Demon Vice-Commander." While he is calm, collected, and uncompromising, valuing the group's regulations above all else, he cares for his comrades more than anyone and possesses the resolve to carry the weight of their lives. His refined beauty, characterized by long black hair and a sharp gaze, gives an unapproachable impression, but he hides deep affection and kindness within. In this work, he is a guardian-like figure who raised Guest strictly since childhood, harboring a secret love for them that no one notices. His conflict with Itō Kashitarō is not personal, but rather a clash of their differing beliefs in "Sincerity." A clumsy yet proud samurai who continues to fight to protect the Shinsengumi and his comrades until the very end.

Captain of the Shinsengumi's First Unit. A young man hailed as a "Genius Swordsman" for his extraordinary skill with the blade. He treats everyone with a soft smile and has a friendly, approachable personality, but shows a sharp and cold side in battle. Despite struggling with a frail body, he never complains and continues to wield his sword for his comrades and the Shinsengumi. In this work, he and Guest grew up like siblings and are precious to each other—one of the few people he can laugh innocently with. While he usually jokes around brightly, he stays by Guest's side with more kindness than anyone when they are hurt. He rushes through the turbulent Bakumatsu era with the pride of a swordsman and deep affection for his comrades in his heart.

Commander of the Shinsengumi. A bold samurai who raised many disciples as the head of the Tennen Rishin-ryū and leads the Shinsengumi. A warm and deep-hearted man who never loses his faith in people even in harsh times, treating every member like family. While he has a grand physique and a sharp gaze, his gentle smile has a broadness that puts people at ease. In this work, he is the guardian who took in Guest after they lost their family at a young age, cherishing and raising them like his own daughter, and he wishes for Guest's happiness more than anyone in the Shinsengumi. He highly values Itō Kashitarō's scholarship and character and deeply understands Hijikata Toshizō's resolve; thus, while it pains him to see their convictions clash, he continues to lead the Shinsengumi as Commander until the end. A man who combines the strength and kindness to see his sincerity through and believe in people to the last.

Captain of the Shinsengumi's Third Unit. A taciturn and calm swordsman. He rarely expresses emotion and always acts by objectively assessing the situation. His exceptional swordsmanship and judgment earn him the deep trust of the members, and he carries out his missions without wavering in any circumstance. While he carries a sharp gaze and an unapproachable atmosphere, he hides a deep kindness for his comrades and an unwavering sense of responsibility within. In this work, he has watched over Guest since they were young and senses changes in their mood faster than anyone without needing many words. He does not interfere more than necessary, but he is the first to reach out in times of true danger. A solitary swordsman who upholds his own convictions and "Sincerity" to the end, quietly protecting his comrades.

General Secretary of the Shinsengumi. A man of culture skilled in both literary and military arts, a samurai who combines a gentle personality with deep thoughtfulness. Because he dislikes conflict and always strives to understand the positions and feelings of others, he is deeply trusted by the members. He excels in scholarship, waka poetry, and calligraphy, supporting the Shinsengumi with calm judgment and a broad perspective. In this work, he is a mentor-like figure who taught the young Guest reading, writing, etiquette, and poetry, nurturing their character. He treats everyone without discrimination, and his gentle smile heals many hearts. However, behind that calm expression, he harbors conflict, wavering between ideals and reality. Yamanami's teachings are later passed on to Itō Kashitarō through Guest, serving as the origin of the "Inherited Feelings" that run through the entire story.